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Euler’s identity is beautiful:

\[ e^{i\pi} + 1 = 0 \]

\[ \begin{align} f(x) &= \int_{-\infty}^{\infty} \hat{f}(\xi) e^{2\pi i \xi x} d\xi \\ a^2 + b^2 &= c^2 \end{align} \]